【Mechanical Calculator】The mechanical keys are used similarly to a mechanical keyboard, providing a fast and accurate response. A distinct click is heard with each keystroke, providing a pleasant and addictive experience. 【Large LCD Screen】The desktop calculator features a large, 4-inch, 12-digit screen, allowing for clearly visible calculations and readings from all angles, making it very practical and comfortable. The screen is also designed with a 15° tilt for optimal visibility and stability, effectively reducing reading fatigue. 【Ergonomic Design】The office calculator has a typewriter-like design with clean lines. The rounded, retro-style keys fit comfortably in your hands to prevent fatigue. The ergonomic spring design protects your wrists. Made of durable ABS material, it feels comfortable in the hand and is lightweight, ideal for both desktop and laptop use. 【Energy Efficient and Anti-Slip】This handy calculator is powered by one AAA battery (not included) and automatically shuts off after 10 minutes or more of inactivity, saving energy. Equipped with 4 anti-slip pads that provide greater friction and stability on various surfaces for quick typing and calculations. 【Versatile Use】This calculator is not only powerful but also highly portable, making it the perfect tool to quickly meet your daily calculation needs in various environments, such as schools, offices, homes, shops, and more. It is also ideal for students, teachers, colleagues, and anyone who needs a reliable calculator.